Pressure-retaining- valve



A. B. MYERS.

PRESSURE RETAINING VALVE, APPLICATION man NOV. 10. um. RENEWED OCT.29.1918.

Patented A 1 2 SHEETS SHEET MO p A. B. MYERS.

,PRESSURE RETAINING VALVE. APPLICATlON FILED NOV-10' 1917- RENEWEDOCT-29,1918. 1,312,453.

Patented Aug. 5, 1919.

2 SHEETSS- EEEE 2.

UNITED STATES rarer nnrnn.

ALFRED B. MYERS, OF GATES, OREGON.

PRESSURE-RETAINING VALVE.

Application filed November 10, 1917, Serial No. 201,332. Renewed October29, 1918.

To all whom it may concern:

Be it known that I, ALFRED B. lvlYnRs, a citizen of the United States,residing at Gates, in the county of Marion and State of Oregon, haveinvented new and useful Improvements in Pressure-Retaining Valves, ofwhich the following is a specification.

This invention relates to new and useful improvements in pressureretaining valves for use in connection with air brakes and the principalobject of the invention is to provide means which will enable theengineer to retain the brakes in braking position on the cars and toreduce the pressure of said brakes whenever necessary.

Briefly, the invention comprises a valve connected With the retainingchamber and having a plunger for operating the valve, means foroperating the plunger by the pressure from an auxiliary pressure tankand .means for controlling said pressure by a valve in the cab of theengine.

Another object of the invention is to provide a device of this characterwhich is simple and durable in construction, reliable and eflicient inoperation and one which can be manufactured and placed upon the marketat a minimum cost.

The invention also consists in certain other features of constructionand in the combination and arrangement of the several parts, to behereinafter fully described, illustrated in the accompanying drawingsand specifically pointed out in the appended claims.

In describing my invention in detail, reference will be had to theaccompanying drawings wherein like characters denote like orcorresponding parts throughout the several views, and in which Figure 1is a diagrammatic view illustrating the arrangement of the various partsof the invention.

Fig. 2 is an enlarged longitudinal sectional view taken through thepressure retaining valve.

Fig. 3 is a longitudinal section of the engineers valve.

Fig. 4 is a cross sectional view on line 4-4 of Fig. 3.

In these views 1 represents the main reservoir which is connected withthe train pipe 2 in the ordinary manner and connection between the twois controlled by the usual engi neers valve 3. The train pipe isconnected with the brake cylinders as usual and as these elements formno part of my invention they Specification of Letters Patent.

will not be described further. at indicates the auxiliary reservoirwhich is connected with the main reservoir by pipe 5 in which is areducing valve 6. 8 indicates a part of the retaining chamber which issuitably connected with the brake cylinders as usual. To this chamber issecured my improved air retaining valve indicated generally by thenumeral 9. As shown this valve comprises a body part 10 having thechamber 11 therein and the passages 12 and 13 extending from each end ofthe body and communicating with the chamber 11. As will be seen thepassage 13 is in a diiferent longitudinal plane from the passage 12 sothat said passages are out of alinement, the passage 12 communicatingwith the chamber 10 at the upper end thereof and the top of said chamerhaving a groove 11 therein which forms a continuation of the passage 12and communicates with an oil passage 15 centrally arranged and leadingfrom the top of the chamber through the body. 16 indicates a valve seatadapted to rest on the top of the chamber and provided with a centralhole 17 of tapered formation on its lower edge to receive a ball valve18. This valve seat is in the form of a plate and I prefer to have thesame provided with screw threads on its edges to engage with screwthreads formed on the wall of the chamber. As will be seen the groove 14passes under the valve seat and communicates with the opening therein sothat the air passing through the passage 12 must pass through the hole17 in the valve seat and as the passage 13 is located below the valveseat the air passing through said seat will flow through the saidpassage 13 which leads to the atmosphere by means of the bent pipe 19.20 indicates a cylinder having its end screwed into the lower end of thechamber 11 so that said cylinder extends at right angles to the body 10.21 indicates a piston in said cylinder provided with the usual packingrings 22 and having its upper end provided with a rounded depressionadapted to engage the ball valve 18. The lower end of this cylinder isclosed by the cap 23 into which a pipe 944: is tapped. This pipe leadsto the reservoir 4.

25 indicates the controlling valve for the pipe 24 which is located inthe cab of the engine and this valve comprises the cupshaped shell 26connected at different points to parts of the pipe 24 leadingrespectively from the auxiliary reservoir and the retaining valve and itis also provided with a. third port 27 leading to the atmosphere. 28indicates the valve body fitting in the shell and provided with the twoports 29 and 30 which are arranged at right angles to each other andhave their inner ends in communication. 31 is a screw cap fitting oversaid shell and 32 is a handle connecting with the projecting part of thebody for operating the same. It will be seen that by moving the valvebody the auxiliary reservoir may be put into communication with thecylinder 20 or said cylinder may be put into communication with theatmosphere by way of the port 27. 33 indicates a cut-off valve placed inthe pipe 2% so the pipe with the retaining valve on any particular carmay be cut out of the system. 34-. is a hand retaining valve located onthe pipe 19. This valve is normally in open position.

It will thus be seen thta after an application has been made of thebrakes the engineer may retain the brakes in said position by turningthe valve 25 so as to put the cylinder 20 in connnunication with theauxiliary tank l. This will cause the piston to move upwardly so as toforce the valve 18 on its seat and thus retain the air in the cylinders.When the brakes are to be released the engineer may do this by operating the valve 25 to put the cylinder in co1n-- municati on with theatmosphere. The valve 18 together with the piston will be forced awayfrom the seatby the pressure in the retaining chamber or by the actionof gravity so that the air may escape through the passages 12 and 13 andthe pipe 19. Or if the engineer simply wishes to reduce the pressure ofthe brakes upon the wheels he may do this by quickly manipulating thevalve 25 to reduce the pressure in the braking" chambers.

I utilize the passage 15 as an oil-duct and close the same by a plug 15.As will be seen a few drops of oil placed in this passage will passthrough the opening in the valve seat so as to thoroughly lubricate thedifferent partsincluding the piston.

It is thought from the foregoing description that the advantages andnovel features of my invention will be readily apparent.

I desire it to be understood that I may make slight changes in theconstruction and in the combination and arrangement of the severalparts, provided that such changes fall within the scope of the appendedclaims.

What I claim 1s:-

1. A device of the class described comprising a body having a centralchamber and ports passing longitudinally through the body and havingtheir inner ends connecting with said chamber, a removable valve seathaving an opening therein located in said chamber and situated betweensaid inner ends of the ports, a valve in said chamher, a cylinderconnected with said chamber, a piston in said cylinder engaging with thevalve to force the same onto its seat, an air pipe connected with saidcylinder, and a valve in the engine-cab for controlling said pipe.

2'. A device of the class described comprising a body having a chambertherein and longitudinal ports having their inner ends communicatingwith said chamber, a valve seat having screw threaded engagement withthe walls of-said chamber and located between the ends of the ports, acylinder having screw threadedengagement with said chamber and extended6 at right angles from said body, a ball valve in said chamber, a pistonin the cylinderfor forcing the valve onto its seat, an air pressure pipeconnected with said cylinder, and means in he engine-cab for controllingsaid pipe.

3. A device of the class described comprising a body having apassage-Way therethrough, a valve controlling said, passageway, a pistonfor forcing said valve onto its seat, a cylinder for receiving saidpiston, an air pipe connected with said cylinder, an air reservoirconnected with said pipe, a three-way valve in said pipe for placing thecylinder in communication with the reservoir or with the atmosphere.

In testimony whereof I aflix my signature.

ALFRED B. MYEns.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

